Heavy Metal Ion Adsorption in Aqueous Solutions
Summary
Heavy metal contamination of watercourses represents a pressing environmental and public health challenge, owing to the toxicity, persistence and bioaccumulative nature of ions such as lead, cadmium, mercury and nickel. Adsorption has emerged as a versatile and cost-effective technology for the removal of these pollutants, combining relatively simple operation with the possibility of regenerating or repurposing spent material. Research over the past decade has examined a wide spectrum of adsorbents, from engineered nanomaterials and chemically modified carbons to agricultural by-products and industrial residues. Key parameters influencing performance include surface chemistry, porosity, pH, temperature and contact time. Adsorption mechanisms incorporate physisorption, chemisorption, ion exchange and complexation, often described and compared through kinetic models (for example, pseudo-first-order and pseudo-second-order kinetics) and equilibrium isotherms such as Langmuir and Freundlich. Surface modification strategies—introducing thiol, carboxyl or amine groups—can dramatically enhance selectivity and capacity. Recent advances have focused on developing low-cost biosorbents, valorising waste streams and integrating adsorption units into broader water treatment schemes, thereby addressing both pollution mitigation and circular-economy objectives at a global scale.
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Heavy Metal Ion Adsorption in Aqueous Solutions publication trend
The graph below shows the total number of articles in heavy metal ion adsorption in aqueous solutions across all publications each year (not limited to Nature Index journals).
Technical terms
Adsorption: Accumulation of ions or molecules from a fluid phase onto the surface of a solid, driven by physical or chemical forces.
Adsorbent: A solid material with active sites capable of binding target species from a liquid or gas.
Langmuir isotherm: A model assuming monolayer adsorption on a homogeneous surface with finite and identical sites.
Freundlich isotherm: An empirical model describing adsorption on heterogeneous surfaces with non-uniform energy distribution.
Chemisorption: Adsorption involving the formation of chemical bonds between adsorbate and adsorbent, typically irreversible and energetically strong.
Pseudo-second-order kinetics: A kinetic model where the rate-limiting step is assumed to involve chemisorption, proportional to the square of the number of unoccupied sites.
Biosorbent: A biologically derived material, often agricultural or forestry waste, used for adsorption of pollutants due to its inherent surface functionality.
References
- Superior Heavy Metal Ion Adsorption Capacity in Aqueous Solution by High-Density Thiol-Functionalized Reduced Graphene Oxides. Molecules (2023).
- Biosorption of Nickel (II) from Aqueous Solutions onto Pistachio Hull Waste as a Low-Cost Biosorbent. Civil Engineering Journal (2019).
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